You aren't understanding the whole concept of the configs. Each config within the config object will get a getter and setter method created. The getter will simply return the value of the property the setter however does more than just sets the property. When the setter method is executed it first looks to see if there is an applier method. If there is it will execute that applier method that can transform the value into something and returns that. It then sets the property. Then it will see if there is an updater method, if there is then it will execute that updater method. The updateDayText is an updater method so you shouldn't really call it but call it's setter method.

. When you asked me for an example on how to use it, I had to come up with an example.
So I gave that example to you.

Usually I am only using 'get' and 'set' so this seems to be a big misunderstanding.
Anyways thanks for sharing the knowledge so that I know now why to only use the get and set and you helped me finding the right code example, which should have been: